EJERCICIO

1. The world in which we live is our ...................................
2. Smoke, noise and rubbish are all types of ....................................
3. A lot of ............................... is ............................in the sea.
4. Many cities have special facilities for ..................................rubbish.
5. Every year a number of species of animals become .................................
6. Don't swim in the sea here because the water is ......................................
7. People who live next to the rubbish...................... have to put up with the bad smell from all the rubbish.
8. Greenpeace is an ......................................organization.
9. Big cars ...........................more than small cars.
10. ..........................is the science that studies the relationship between different life forms.